The problem is that it’s the developers’ instance and they promote it as a default general use instance and not a explicit political ideological instance so it has a significant portion of people just trying to join the network.

I would recommend someone looking to join the threadiverse to use piefed over Lemmy for that reason (of course piefed has its own problematic “features” with regards to default mute lists and transparency)

Instances that don’t vet users sufficiently get defederated for spam. Users then leave for instances that don’t get blocked. If instances are too heavy handed in their moderation then users leave those instances for more open ones and the market of the fediverse will balance itself out to what the users want.